NVIDIA GeForce GTX 850A vs NVIDIA GeForce GT 645 OEM
What is the difference between NVIDIA GeForce GTX 850A and NVIDIA GeForce GT 645 OEM. Find out which graphics card has better performance.
Graphics Processor (GPU)
| GM107 | GPU Name | GF114 |
| Maxwell | Architecture | Fermi 2.0 |
| TSMC | Foundry | TSMC |
| 28 nm | Process Size | 40 nm |
| 1,870 million | Transistors | 1,950 million |
| 148 mm² | Die Size | 332 mm² |
Graphics Card
| Mar 17th, 2014 | Release Date | Apr 24th, 2012 |
| GeForce 800A | Family | GeForce 600 |
| End-of-life | Production | End-of-life |
| GeForce 700A | Predecessor | GeForce 500 |
| PCIe 3.0 x16 | Bus Interface | PCIe 2.0 x16 |
Memory
| 2 GB | Memory Size | 1024 MB |
| DDR3 | Memory Type | GDDR5 |
| 128 bit | Memory Bus | 192 bit |
| 28.80 GB/s | Bandwidth | 91.87 GB/s |
Performance
| 14.98 GPixel/s | Pixel fillrate | 9.312 GPixel/s |
| 37.44 GTexel/s | Texture fillrate | 37.25 GTexel/s |
| 1,198 GFLOPS | FP32 (float) performance | 894.0 GFLOPS |
| 37.44 GFLOPS (1:32) | FP64 (double) performance | 74.50 GFLOPS (1:12) |
Clock Speeds
| 900 MHz 1800 Mbps effective | Memory Clock | 957 MHz 3.8 Gbps effective |
Render Config
| 640 | Shading Units | 288 |
| 40 | TMUs | 48 |
| 16 | ROPs | 24 |
| 64 KB (per SMM) | L1 Cache | 64 KB (per SM) |
| 2 MB | L2 Cache | 384 KB |
Board Design
| IGP | Slot Width | Dual-slot |
| 45 W | Thermal design power (TDP) | 102 W |
| No outputs | Display Connectors | 2x DVI 1x mini-HDMI |
API support
| 12 (11_0) | DirectX | 12 (11_0) |
| 4.6 | OpenGL | 4.6 |
| 3.0 | OpenCL | 1.1 |
| 1.1 | Vulkan | N/A |
| 5.1 | Shader Model | 5.1 |
| 5.0 | CUDA | 2.1 |